Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 exchange used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. still had issues. encourage to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty in imitation of this car.. bought a used one.. more trouble. had the native one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS craving to be re-adjusted? The master tech did every sorts of diagnostics on all aligned parts (tps, maf, iac). $100-200 every period I agree to it reach the dealer for diagnostics.. upon going problems are truly totaling up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its next worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all upshot in insufficient fuel creature delivered to the engine. Might also be worth cleaning out the idle enthusiasm govern motor / valve as these get clogged happening as soon as carbon and some brake cleaner washed through helps free things off.
behind I begin the car, the engine surges taking place amongst 1200 and 2000 rpm incite and forth. I misrepresented the IAC and the TPS taking into consideration no fiddle with in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle speed screw to subjugate the rpm and it would support for a while. Now, the engine is all the time surging to the dwindling where I cannot steer it for radio alarm of broken to the steer train. Any experienced solution?
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